论文标题
$ x（3860）$生产与$ j/ψ$通过$ e^{+}
$X(3860)$ production in association with $J/ψ$ via $e^{+}e^{-}$ annihilation at Belle
论文作者
论文摘要
在本文中，我们研究了$ x（3860）$生产与$ J/ψ$通过$ e^{+} e^{ - } $ nlo nlo-nlo qcd qcd准确性的nlo nihihilation，在非递归QCD（NRQCD）框架内。在$ j^{pc} _ {x（3860）} = 0^{++} $的假设下，预测的总交叉部分与$ \ sqrt {s} =υ（4s，5s）$的Belle的测量值非常吻合，而理论结果则为$ 2^} $ pactees note。这与美女的结论一致，即$ 0^{++} $假设比$ x（3860）$的$ 2^{++} $假设所偏爱。尽管总横截面达成协议，但NRQCD预测似乎与Belle测量的$ J/ψ$角度分布不相容。我们还执行$σ_{e^{+} e^{ - } \至j/ψ+x（3940）} $的NLO计算，以$ j^{pc} _ {x（3940）} = 0^{ - +} $进行nrqccd conseniments coniments conforeiments acrounimients acrounimients acrounce acrounimients acrounce acrounimients prominiments acrounimients acrounimients acrounce acrounimitience。
In this paper, we study the $X(3860)$ production associated with $J/ψ$ via $e^{+}e^{-}$ annihilation at the next-to-leading-order (NLO) QCD accuracy, within the nonrelativistic QCD (NRQCD) framework. Under the hypothesis of $J^{PC}_{X(3860)}=0^{++}$, the predicted total cross sections agree well with the Belle's measurements at $\sqrt{s}=Υ(4S,5S)$, while the theoretical results given by the $2^{++}$ hypothesis significantly undershoot the data. This is consistent with the Belle's conclusion that the $0^{++}$ hypothesis is favored over the $2^{++}$ hypothesis for $X(3860)$. Despite the agreement of the total cross sections, the NRQCD predictions seem to be incompatible with the Belle-measured $J/ψ$ angular distributions. We also perform the NLO calculations of $σ_{e^{+}e^{-} \to J/ψ+X(3940)}$ on the assumption of $J^{PC}_{X(3940)}=0^{-+}$, discovering that the NRQCD predictions that coincide with the light-cone results are in good agreement with the experiment.
